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smackerdemuxer: check some values before instead of just after malloc() 

Fixes Ticket777
Bug Found by: Diana Elena Muscalu

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-12-16 02:57:22 +01:00
parent e2a16e82b1
commit c402c1c976
1 changed files with 5 additions and 1 deletions
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6
libavformat/smacker.c
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@ -255,6 +255,8 @@ static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
memcpy(oldpal, pal, 768);
size = avio_r8(s->pb);
size = size * 4 - 1;
if(size + 1 > frame_size)
return AVERROR_INVALIDDATA;
frame_size -= size;
frame_size--;
sz = 0;
@ -289,10 +291,12 @@ static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
/* if audio chunks are present, put them to stack and retrieve later */
for(i = 0; i < 7; i++) {
if(flags & 1) {
int size;
unsigned int size;
uint8_t *tmpbuf;
size = avio_rl32(s->pb) - 4;
if(size + 4L > frame_size)
return AVERROR_INVALIDDATA;
frame_size -= size;
frame_size -= 4;
smk->curstream++;